Complete the game and load the clear save. Unlockables must be purchased using spirit points to be usable.

Unlockable	How to Unlock
Equipped Function: Festival	Complete the ghost list
Equipped Function: Infinity	Clear all missions with S rank
Equipped Function: Sense	Complete the game once and capture at least 100 ghosts
Upgraded Lens: Lunar/Moon	Complete the game in nightmare mode
Upgraded Lens: Stop	Complete the game once